This activity is more appropriate for school aged children.
Take a foam meat tray and trim the curved edges off of it making it flat. Have the children take a pencil and etch a snowman on it. If the children choose they can add a snow by poking dots around the snowman. Have the children paint over the design with white paint. Have them lay a piece of black construction paper over the painted tray and press. Carefully lift the paper off and they will have a beautiful print.
These make beautiful Christmas Cards. To to that, have the children fold a piece of construction paper in half and stamp the snowman on the front of the card.